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526                              GENERA OF FRUIT BATS                             CHAP>

three remaining below; while there is but one molar in each
upper jaw, and two in each lower. Dr. Dobson has studied
the structure of the remarkable pharyngea] sacs which exist in
the neck of the male, and are capable of inflation.

Pteralopex of the Solomon Islands has shorter ears than have
many Pteropus, otherwise its external characters are the same.
As in Pteropus nicobaricus, this genus has the orbits shut off by a
bony ring, an extremely rare phenomenon in Bats. The canines
have two cusps. The characters of the grinding teeth have
already been mentioned. It is uncertain whether the only
species of this genus, P. atrata, is, or is not, a vegetable feeder.
Harpyia has shortish ears and extraordinarily prolonged and
tubular nostrils. There is a hint of the accessory cusp to the
canines mentioned above in Pteralopex. The incisors are reduced
to one on each upper jaw, and none below. Cynopterus has also
often bituberculate canines. It is an Oriental genus with several

JWesonycteris, with one species from the Solomon Islands, N.
woodfordi, has the dental formula I J C -J- PDCL  M -. The index
finger has no claw; the tail is absent. The premaxillae are
separated anteriorly.

Eowycteris, with a single cave-dwelling species from Burmah,
jgT. spelaea, has also no claw upon the index; the tooth formula
is fuller by reason of the presence of an additional incisor below.
The tongue is very long and is armed with papillae. There is a
short but distinct tail.

Notopteris, from New Guinea and the Fiji Islands, is dis-
tinguished from the related genera by its long tail.

The remaining genera of Fruit Bats are Boneia, Harpyionyc-
teri$t Cephalotes, Callinycteris, and Macrogrlossus, from the Oriental
region, and Scotonycteris, Liponyx, and Megaloglossus from the
Ethiopian region; finally, there is the Australian Melonycteris.

The members of this sufo-order are mostly insectivorous though
occasionally " frugivoroiis or sanguivorous " Bats. The molars are
multicuspid with sharp cusps. The palate is not continued back
the last molar. The second finger has but one phalanx, or